A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable Home Addition Contractor Across Northridge
Adding square footage to a Northridge home usually costs between $185 and $420 per square foot depending on whether you’re doing a bump-out, a full room addition, or a garage conversion. Most additions here run anywhere from $45,000 for a modest bump-out to $225,000+ for a large primary-suite or second-story project. Northridge homeowners planning this work need a contractor who knows the local housing stock, not a generic remodeler who discovers the foundation issues after framing starts. Call Benson ADU Builders at (903) 568-7222 to get a written price before any work begins.
Why Benson ADU Builders Is Northridge’s Preferred Home Addition Contractor Company
Our Home Addition Contractor team has worked on enough ranch-style and mid-century Northridge homes to know what’s behind the drywall before we open it. The houses here went up fast between 1955 and 1975, mostly slab-on-grade with 100-amp panels and original framing that was never designed for today’s open-plan additions. That changes how we scope every job. We don’t quote you a number and then “discover” a foundation problem on day three. We walk the site, check the existing conditions, and write a price that reflects what the addition actually requires.
Every Northridge project includes a written price before work starts, background-checked and uniformed technicians on site, and the 365-Day Done Right Promise in writing. That means if anything we touch isn’t right within a full year, we come back and make it right. No arguing about whether it’s covered. It’s stamped on the contract. Troy Eastman leads our team, and he holds every project to that standard personally.
We coordinate scheduling and dispatch from the brand’s Los Angeles office, so Northridge homeowners get a live person on the phone around the clock, and crews that know the streets from Reseda Boulevard to Tampa Avenue and everywhere between.
Key Takeaways
- Written price before any work starts, no verbal estimates that shift later.
- 365-Day Done Right Promise on every project, in writing.
- We verify foundation and electrical conditions before quoting so the price doesn’t move once framing begins.
- Northridge crews who know mid-century slab-on-grade homes.
Garage Addition Contractors in Northridge
Garage Addition Contractors in Northridge deal with a specific problem other cities don’t have in the same concentration: attached garages on slabs that don’t meet current footing depth requirements. A garage addition here usually means converting or expanding the existing garage footprint into conditioned living space, and it typically runs $60,000 to $140,000 depending on whether you’re doing a straight conversion, a conversion plus a bump-out, or a full attached-garage rebuild with living space above.
What We Check Before Quoting
Before we put a number on a garage addition in Northridge, we verify the existing slab thickness and rebar, check the permit history record for the original garage, and confirm whether the electrical panel can carry the new load. Many homeowners assume their garage conversion is already permitted if it was done years ago. In Northridge, that’s rarely true. The city’s permit history often shows no record of prior conversions, which means we’re bringing the whole thing up to current code and pulling fresh permits.
Garage Conversions With Added Square Footage
When a Northridge homeowner wants to convert the garage and also extend the roofline for a new living room or primary suite, we sequence the foundation pour first, then the panel upgrade, then framing. That order matters. It’s what lets the project pass final inspection without a correction notice.
Bathroom Addition Contractor in Northridge
A Bathroom Addition Contractor in Northridge is going to flag one thing most homeowners don’t think about until it’s too late: the electrical panel. Adding a bathroom means a new 20-amp circuit for the GFCI outlet, a dedicated circuit if you’re adding radiant floor heat or a heated towel bar, and usually a ventilation fan that needs to be on its own run. Northridge homes with original 100-amp panels often can’t legally absorb that without an upgrade. A bathroom addition here typically costs $35,000 to $85,000 for a three-piece bath, and more if you’re adding a primary-bath suite with dual vanities and a walk-in shower.
Plumbing and Slab-On-Grade Reality
Because most Northridge homes are slab-on-grade, adding a new bathroom means cutting into the slab to tie into the existing drain line, not running pipes through a crawl space. That’s more labor and more cost, but it’s also predictable. We quote it line by line so you know the slab work is in the price before we cut anything.
Wet Wall Placement and Existing Vent Lines
If your new bathroom can share a wet wall with an existing full bath or laundry, the plumbing cost drops significantly. We look for that first. A well-placed bathroom addition on a shared wet wall in Northridge can run at the lower end of the range, around $35,000 to $45,000.
Trusted Brands We Service in Northridge
Northridge homeowners don’t have to settle for whatever a contractor decides to frame up. We’re authorized to build with leading prefab and materials brands including Cover, Dvele, and Boxabl, plus James Hardie cladding. That means you can walk over to the showroom, open the door on a Cover or Dvele panel system, read their specs, and verify what you’re getting before we ever order a single panel. For Northridge customers, having these brands available means shorter framing timelines and tighter build tolerances than site-built framing alone. We keep material lead times local so the permit clock doesn’t run out while waiting on a shipment.
Common Home Addition Contractor Problems We See in Northridge Homes
- Invisible foundation deficiencies. Homes built in the late 1950s and 1960s were poured to old footing standards. The existing slab often doesn’t meet current depth requirements for new load-bearing walls, which means a new footing pour has to happen before framing.
- 100-amp electrical panels at capacity. Most Northridge originals are 100-amp panels. Add a new bedroom, bathroom, or HVAC zone and you’re over the load calc. The panel upgrade gets sequenced in, and if it isn’t scoped up front, it becomes an expensive change order.
- Unpermitted prior conversions. A garage converted in 1982 with no permit record is a liability at resale and a code problem for any new addition that ties into it. We pull the records and bring everything current before new work starts.
- LADBS plan-check timing surprises. Northridge falls under the San Fernando Valley processing queue at LADBS. Plan check can stretch the calendar beyond what a homeowner expects, and we set that expectation in writing up front so the schedule is real.
Pricing for Home Addition Contractor in Northridge, CA
A bump-out addition in Northridge generally runs $45,000 to $90,000. A full bedroom or family room addition lands between $90,000 and $160,000. Primary-suite additions and second-story work run $140,000 to $300,000. Those numbers are for permitted work including plan check, foundation verification, framing, roofing, drywall, finish electrical and plumbing, paint, and trim. The biggest cost drivers in Northridge specifically are whether we’re cutting into slab for a new bathroom, whether the original 100-amp panel needs an upgrade, and whether LADBS plan-check time extends the carrying cost. We give you a written line-item price before any work starts, so you know exactly what you’re paying for. Call (903) 568-7222 for a free estimate and a written scope.
| Addition Type | Typical Northridge Range |
|---|---|
| Bump-out (200 – 400 sq ft) | $45,000 – $90,000 |
| Bedroom / family room addition | $90,000 – $160,000 |
| Bathroom addition | $35,000 – $85,000 |
| Garage addition / conversion | $60,000 – $140,000 |
| Primary suite addition | $140,000 – $225,000 |
| Second story addition | $180,000 – $300,000+ |
We Also Serve Cities Near Northridge
Our crews handle additions and ADUs throughout the San Fernando Valley. You’ll find us working in Northridge, Reseda, Porter Ranch, Chatsworth, and Granada Hills, with the same written pricing and 365-Day Done Right Promise on every job. If you’re just outside the main Northridge streets, give us a call and we’ll confirm coverage for your block.
Serving Northridge, CA - Our Local Coverage Area
We’re based in the Northridge area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Home Addition Contractor in Northridge
Yes, most Northridge additions on slab-on-grade homes require a foundation evaluation, and in some cases a soils report, before the city will issue a permit for new load-bearing walls. Our team verifies the existing slab thickness and rebar condition during the scoping walk so the report happens once, not twice. Call (903) 568-7222 and we’ll walk your lot and tell you what LADBS will require before you spend a dollar on design.
Yes, but only if the existing garage slab can carry the new framing and the electrical service has enough capacity for both the converted space and the new addition. We recently worked on a ranch-style home near Reseda Boulevard and Devonshire Street where the homeowners wanted exactly that: a primary-suite addition plus a garage conversion. The existing garage slab didn’t meet current footing depth requirements, and the main panel was a 100-amp service, so we sequenced a panel upgrade and a new footing pour before framing. The project passed final inspection without a correction notice. Yours may need the same sequencing.
Plan check at LADBS for Northridge runs through the San Fernando Valley processing queue, and most additions take 8 to 16 weeks for plan check approval depending on scope and what the reviewer flags. That’s a real number, not a sales pitch. We submit complete drawing sets the first time, which eliminates the back-and-forth that stretches timelines. Call for a free estimate and we’ll give you a written calendar with the permit window built in.
Usually yes, if your home still has the original 100-amp panel. A new bathroom needs a dedicated 20-amp GFCI circuit, and radiant floor heat or a heated towel bar adds another dedicated circuit. When the load calculation goes over capacity, the panel upgrade becomes part of your written price before work starts, not a surprise after demo. That’s the difference between a real quote and a verbal estimate.
The price changes when the foundation or electrical work wasn’t scoped in the original quote. Missing the slab verification, missing the panel upgrade, or assuming an as-built garage conversion is grandfathered are the three most common change-order triggers in Northridge. Benson ADU Builders puts those line items in the written price from the first conversation, so the number you sign is the number you pay unless you change the scope. Call (903) 568-7222 for a written quote with no vague allowances.
Written by Troy Eastman, Owner at Benson ADU Builders, serving Northridge and the San Fernando Valley with written pricing and the 365-Day Done Right Promise on every project.
